US10732419B2ActiveUtilityA1
Head-up display
Est. expiryApr 26, 2036(~9.8 yrs left)· nominal 20-yr term from priority
Inventors:Takahiro Nambara
B60K 37/20B60K 35/23G02B 27/01G02B 27/0101G02B 2027/0183G02B 2027/011G02B 27/0179G02B 2027/013B60K 2370/334B60K 35/00B60K 2360/23B60K 2360/334
38
PatentIndex Score
0
Cited by
8
References
3
Claims
Abstract
A head-up display device is configured to project a display light, which is to be reflected by a concave image forming reflection surface, onto a combiner having the image forming reflection surface a combiner to display a virtual image visible to an occupant. The combiner is located above an upper surface portion of the instrument panel. The projector is configured to project a display light in the form of a light beam. A light guide mirror has a light guide reflection surface and is configured to reflect the display light from the projector toward the image forming reflection surface. The light guide reflection surface is convex.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A head-up display device configured to project a display light, which is to be reflected on a concave image forming reflection surface, onto a combiner having the concave image forming reflection surface and to display a virtual image visible to an occupant, the combiner mounted on an instrument panel of a vehicle and located above an upper surface portion of the instrument panel, the head-up display device comprising:
a projector configured to project the display light in a form of a light beam; and
a light guide mirror including a light guide reflection surface configured to reflect the display light from the projector toward the image forming reflection surface, wherein
the light guide reflection surface is convex, wherein
the projector includes:
a light source unit configured to emit a light; and
an optical opening portion optically opened and configured to allow the light emitted from the light source unit to pass through the opening to form an image and to project the image as the display light, wherein
an optical power of the light guide reflection surface is defined as ϕ1,
an optical power of the image forming reflection surface is defined as ϕ2,
a distance between the image forming reflection surface and the light guide reflection surface is defined as L 3 ,
a distance between a conjugate point optically conjugate with the light source unit and the virtual image visually recognized from the conjugate point is defined as Id which is a value smaller than zero,
a light beam radius of the display light at the conjugate point is defined as Es,
−Es/Id is defined as A and Es+Ed−(Es/Id) is defined as B, and
the following expression is established,
B
-
L
3
·
(
A
+
B
·
ϕ2
)
(
A
+
B
·
ϕ2
)
+
{
B
-
L
3
·
(
A
+
B
·
ϕ2
)
}
·
ϕ1
>
0
[
Expression
2
]
a distance between the light guide reflection surface and the optical opening portion is defined as L 4 ,
a half angle of view of the virtual image is defined as θ,
θ is defined as C,
−Ed−θ is defined as D, and
the following expression is established,
D
-
(
C
+
D
·
ϕ2
)
·
L
3
-
L
4
·
[
(
C
+
D
·
ϕ2
)
+
{
D
-
(
C
+
D
·
ϕ2
)
·
L
3
}
·
ϕ1
]
(
C
+
D
·
ϕ2
)
+
{
D
-
(
C
+
D
·
ϕ2
)
·
L
3
}
·
ϕ1
<
0.
[
Expression
4
]
2. The head-up display device according to claim 1 , wherein
a combined focal length of the image forming reflection surface and the light guide reflection surface is positive.
3. The head-up display device according to claim 1 , wherein
the light guide mirror is located below the upper surface portion.Cited by (0)
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